Fix deprecated method root for send module

lib/cli/index.js

@@ -7,7 +7,6 @@ var tinylr = require('tiny-lr');
 var Promise = require('../utils/promise');
 var PluginsManager = require('../plugins');
 var Book = require('../book');
-var initBook = require('../init');
 
 var helper = require('./helper');
 var Server = require('./server');

lib/cli/server.js

@@ -64,8 +64,9 @@ Server.prototype.start = function(dir, port) {
             }
 
             // Send file
-            send(req, url.parse(req.url).pathname)
-            .root(dir)
+            send(req, url.parse(req.url).pathname, {
+                root: dir
+            })
             .on('error', error)
             .on('directory', redirect)
             .pipe(res);